Eastern Phoebe (Sayornis phoebe)
Gray-brown upper with whitish lower and bobs tail when perched.  Nests in moss and mud on ledges and on bridges.  Will generally prefer not to feed from feeders but can be attracted to narrow ledges under eaves of roofs.  Will return to the same nest every season.  Length is 7 inches.  Weight, 0.4 ounces.